I don't think that really tells the whole story for Dallas. Things changed a lot for them (for the better) after the trade deadline. I think they actually had the #1 defense in the league since then (heard that on Windhorst's pod) and they had the #1 clutch offensive rating in the league this year. So if the games are close, I would bet on Dallas. Assuming Mavs/Celtics does happen, I think the Mavs win in 7.Too lazy to look but it would have to be extraordinarily rare for a team (Dallas in this instance) with the 10th ranked ORTG and 18th DRTG (or worse combinations) to win the Finals.
Boston is ranked 1st and 3rd respectively.